使用javamail进行kerberos身份验证

Question

我需要在Widows Exchange Server和javamail API之间配置kerberos身份验证。我已经完成了这些设置。但我得到 erro r喜欢：

Exception in thread "main" GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)
    at sun.security.jgss.krb5.Krb5InitCredential.getInstance(Krb5InitCredential.java:147)
    at sun.security.jgss.krb5.Krb5MechFactory.getCredentialElement(Krb5MechFactory.java:121)
    at sun.security.jgss.GSSManagerImpl.getCredentialElement(GSSManagerImpl.java:192)
    at sun.security.jgss.GSSCredentialImpl.add(GSSCredentialImpl.java:406)
    at sun.security.jgss.GSSCredentialImpl.<init>(GSSCredentialImpl.java:60)
    at sun.security.jgss.GSSManagerImpl.createCredential(GSSManagerImpl.java:153)

任何人都可以帮我找到如何从javamail api中找到kerberos tgt。